Considering it is possible to take conscious control of body's organs-processes and guide them. Hair might need this conscious control to stop or guide it.
Shaving beard and cutting hair when body is naturally supposed to have them, is detrimental to health. Have noticed it on myself, the longer they are the better I feel, subtle differences but still there. And I look much better with long hair and beard than without.
Hair also has sensory functions. The longer the hair the more subtle changes, that hair can receive, can be noticed. With more hair and longer hair will be naturally able to perceive more and more easily. Same can be achieved with less, but that requires a more refined mind and body in other ways. And there's more ways than one to have the same end effect/result.
Cutting hair when hair is natural is like fighting against oneself. Like suppressing who one is, forcing oneself to be in a smaller box than one can fit into. Lessening freedom, restricting and limiting. Forcing onto oneself what one is not, thus not being oneself.
But cutting hair can be used to improve other paths of perception with more ease or emphasis.
Men are raised to know that cutting hair and shaving is the right thing to do. They grow up never thinking whether they actually like it or not, how it really feels or not. They generally do it merely because they see others doing it, or because they were raised to do it. I did it, until I thought things through and found out I have never liked shaving or cutting hair. It's like following rules that have never really been accepted; going against own will and wishes, consciously or subconsciously.
I'm not a hairless guy and I like hair, so no point imitating being one without. I'd rather be myself than try to be someone I am not.